<https://hometalk.chiefarchitect.com/topic/1894-spline-terrain-walls-walkways/#comment-10706>
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"Hi Alan, I'm not understanding your situation.  The walkway looks curved to me.  Can you better explain what you mean?  A 3D pic would help a lot too. "
<https://hometalk.chiefarchitect.com/topic/1894-spline-terrain-walls-walkways/>